Chess.com

Chess.com is an internet chess server, internet forum and social networking website. The site has a freemium model in which some features are available for free, and others for accounts with subscriptions. We even have a Mensa Club! Right now they are even playing a slow game for the next few days after June 28, 2021. Actually two.

Code.org

Code.org® is a nonprofit dedicated to expanding access to computer science in schools and increasing participation by young women and students from other underrepresented groups. Our vision is that every student in every school has the opportunity to learn computer science as part of their core K-12 education. The leading provider of K-12 computer science curriculum in the largest school districts in the United States, Code.org also created the annual Hour of Code campaign, which has engaged more than 15% of all students in the world. Code.org is supported by generous donors including Microsoft, Facebook, Amazon, the Infosys Foundation, Google and many more.

https://code.org/

Scratch

With Scratch, you can program your own interactive stories, games, and animations — and share your creations with others in the online community.

Scratch helps young people learn to think creatively, reason systematically, and work collaboratively — essential skills for life in the 21st century.

Scratch is designed, developed, and moderated by the Scratch Foundation, a nonprofit organization. It is provided free of charge.

https://scratch.mit.edu/